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ASTM C27 aligns new precast standard with AASHTO LRFD specs

Sources: ASTM International, West Conshohocken, Pa.; CP staff

ASTM Committee C27 on Precast Concrete Products is set to publish a standard (C1889) for designing drainage and utility infrastructure. The document essentially codifies requirements for precast structures from American Association of State Highway and Transportation Officials load and resistance factor design (LRFD) specifications, and also addresses soil, hydrostatic, surcharge plus other loads.

Read more: ASTM C27 aligns new precast standard with AASHTO LRFD specs

Logistics challenges temper fly ash consumption, CCP recycling rates

Sources: American Coal Ash Association, Farmington Hills, Mich.; CP staff

Supply dynamics in key regional markets, primarily linked to coal-fueled power plant closures, spurred an 11 percent year-over-year decline in fly ash consumption in concrete, according to the American Coal Ash Association’s (ACAA) just-released “Production and Use Survey” for 2018. Concrete-grade ash accounted for 12.5 million of the 59.4 million tons of coal combustion products (CCP) beneficially used last year; use of all CCP grades in cement production dropped to 6.4 million tons, off 26 percent from 2017 levels.

Read more: Logistics challenges temper fly ash consumption, CCP recycling rates

ASTM C09 formulates colloidal silica standard

Sources: ASTM International, West Conshohocken, Pa.; CP staff

The proposed New Specification for Colloidal Silica for Use in Concrete (WK60809) under ASTM Committee C09 on Concrete and Concrete Aggregates will cover a versatile nanoparticle imparting durability characteristics in slabs and structures.

Read more: ASTM C09 formulates colloidal silica standard

EPD data-fueled embodied carbon tool debuts at Greenbuild

Sources: Carbon Leadership Forum, Seattle; CP staff

The Carbon Leadership Forum (CLF), a University of Washington College of Built Environments-hosted coalition of architecture, engineering and construction stakeholders, formally launched the Embodied Carbon in Construction Calculator (EC3) tool in public beta version at the U.S. Green Building Council’s Greenbuild International Conference & Expo in Atlanta. Embodied carbon volumes reflect carbon dioxide emissions attributable to material or product processing, fabrication, delivery, and erection or placement. 

Read more: EPD data-fueled embodied carbon tool debuts at Greenbuild

Top engineer validates structural elements’ embodied carbon

Sources: Thornton Tomasetti, New York; CP staff

A global engineer’s seven-year survey of 600-plus buildings assesses materials, structural components and facility types with the highest embodied carbon, and cites a market-driven trend toward increased use of supplementary cementitious materials and recycled steel as the largest driver of a reduction in that metric. 

Read more: Top engineer validates structural elements’ embodied carbon